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- W67224284 abstract "We have investigated the ability of LIPOFECTAMINE, a polycationic lipid reagent used in DNA transfection, to translocate E. coli lipopolysaccharide (LPS) into HeLa cells. Although HeLa cells did not spontaneously take up fluorescein isothiocyanate-labelled LPS (FITC-LPS) from the culture medium, the cells that were co-incubated with greater than 1 g/mL FITC-LPS and LIPOFECTAMINE showed punctate fluorescence. Virtually all cells were loaded on incubation with 100 micrograms/mL FITC-LPS. Confocal scanning laser microscopy showed extensive FITC-LPS loading in the cytoplasm of HeLa cells, but no label was evident in the nuclear regions of these cells. Loading with LPS for up to six hours had no effect on the viability of HeLa cells, beyond the 30% reduction in live cells that is attributable to the toxic effect of LIPOFECTAMINE itself. In contrast to cells treated with etoposide for six hours, LPS-loaded cells did not display apoptotic bodies. Exposure of cells to 4 beta-phorbol 12-myristate 13-acetate led to the induction of the immediate early gene c-fos and resulted in an enhanced c-Fos signal, detected by Western blot analysis. In contrast, LPS loading did not alter the c-fos expression in HeLa cells. The loading of LPS into HeLa cells by means of polycationic lipids results in relatively low acute toxicity, as judged from cell viability, morphology and c-fos expression. Therefore, our method appears well suited to the study of acute actions of LPS in the intracellular compartment of mammalian cells." @default.
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- W67224284 date "2000-03-01" @default.
- W67224284 modified "2023-09-26" @default.
- W67224284 title "Polycationic Lipids Translocate Lipopolysaccharide into HeLa Cells" @default.
- W67224284 doi "https://doi.org/10.2144/00283st10" @default.
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